报 告 人：Ridha Khedri[加拿大McMaster University, 国家高端外国专家]报告时间：5月 8日（周五）9: 30报告地点：校本部东区计算机学院大楼1001室邀 请 人：陈怡海 博士内容摘要：Software systems contain paths for information transmission that were not intended by their designers. These paths utilize the systems" resources, environment, or established legitimate communication channels. They are called distributed covert channels and can be used as paths to leak out confidential information to unauthorized recipients. To the unwary user, these channels may transport information as if by magic, despite the vigilance of monitors. Because of this, covert channels pose a significant threat to information security. In a system of communicating agents, if there exists a covert channel, then two conditions are satisfied: Constraint on Communication and Potential for Communication.报告人简介: Ridha Khedri is a Professor of software engineering and a member of the Formal Requirements and Information Security Enhancement (FRAISE) Research Group. He obtained his Engineer Diploma in 1987 from the University of Tunis. He received a M.Sc. and a Ph.D. from Laval University, Quebec, Canada, in 1993 and 1998 respectively. In March 1998, he joined the Communications Research Laboratories of McMaster University as a post-doctoral researcher under the supervision of Prof. David L. Parnas. From December 1998 to June 2005 he was an Assistant Professor at McMaster University. From July 2005 to June 2014 he was an Associate Professor at McMaster University. His research interests include algebraic methods in software engineering, analysis of information security policies and of cryptographic-key distribution scheme, data cleaning, software product families, and formal software requirements analysis. He organized or served on the program committee of more than 30 conferences and workshops. He is a licensed professional engineer in the province of Ontario. He is amember of the Association for Computing Machinery and the IEEE Computer Society.